138 lines
5.6 KiB
LLVM
138 lines
5.6 KiB
LLVM
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; RUN: opt -S -lcssa < %s | FileCheck %s
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; Reproducer for PR39019.
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;
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; Verify that the llvm.dbg.values are updated to use the PHI nodes inserted by
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; LCSSA.
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; For the test case @single_exit, we can rewrite all llvm.dbg.value calls
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; to use the inserted PHI.
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; CHECK-LABEL: @single_exit(
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; CHECK-LABEL: inner.body:
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; CHECK: %add = add nsw i32 0, 2
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; CHECK: call void @llvm.dbg.value(metadata i32 %add, metadata [[VAR:![0-9]+]], metadata !DIExpression())
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; CHECK-LABEL: outer.exit:
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; CHECK-NEXT: [[PN:%[^ ]*]] = phi i32 [ %add.lcssa, %outer.latch ]
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[PN]], metadata [[VAR]], metadata !DIExpression())
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; CHECK-NEXT: call void @bar(i32 [[PN]])
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; CHECK-LABEL: exit:
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[PN]], metadata [[VAR]], metadata !DIExpression())
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define void @single_exit() !dbg !6 {
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entry:
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br label %outer.header, !dbg !12
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outer.header: ; preds = %outer.latch, %entry
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br label %inner.body, !dbg !12
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inner.body: ; preds = %inner.body, %outer.header
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%add = add nsw i32 0, 2, !dbg !12
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call void @llvm.dbg.value(metadata i32 %add, metadata !9, metadata !DIExpression()), !dbg !12
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br i1 false, label %inner.body, label %inner.exit, !dbg !12
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inner.exit: ; preds = %inner.body
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br label %outer.latch
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outer.latch: ; preds = %inner.exit
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br i1 false, label %outer.header, label %outer.exit, !dbg !12
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outer.exit: ; preds = %outer.latch
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call void @llvm.dbg.value(metadata i32 %add, metadata !9, metadata !DIExpression()), !dbg !12
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tail call void @bar(i32 %add), !dbg !12
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br label %exit
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exit: ; preds = %outer.exit
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call void @llvm.dbg.value(metadata i32 %add, metadata !9, metadata !DIExpression()), !dbg !12
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ret void, !dbg !12
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}
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; For the test case @multi_exit, we cannot update the llvm.dbg.value call in exit,
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; because LCSSA did not insert a PHI node in %exit, as there is no non-debug
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; use.
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; CHECK-LABEL: @multi_exit()
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; CHECK-LABEL: for.header:
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; CHECK-NEXT: %add = add nsw i32 0, 2
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %add, metadata [[VAR2:![0-9]+]], metadata !DIExpression())
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; CHECK-LABEL: for.exit1:
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; CHECK-NEXT: [[PN1:%[^ ]*]] = phi i32 [ %add, %for.header ]
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; CHECK-NEXT: br label %for.exit1.succ
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; CHECK-LABEL: for.exit1.succ:
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[PN1]], metadata [[VAR2]], metadata !DIExpression())
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; CHECK-NEXT: call void @bar(i32 [[PN1]])
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; CHECK-LABEL: for.exit2:
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; CHECK-NEXT: [[PN2:%[^ ]*]] = phi i32 [ %add, %for.latch ]
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[PN2]], metadata [[VAR2]], metadata !DIExpression())
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; CHECK-NEXT: call void @bar(i32 [[PN2]])
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; CHECK-LABEL: exit:
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %add, metadata [[VAR2]], metadata !DIExpression())
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define void @multi_exit() !dbg !13 {
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entry:
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br label %for.header, !dbg !14
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for.header: ; preds = %for.latch, %entry
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%add = add nsw i32 0, 2, !dbg !14
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call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !14
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br i1 false, label %for.latch, label %for.exit1, !dbg !14
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for.latch: ; preds = %for.header
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br i1 false, label %for.header, label %for.exit2, !dbg !14
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for.exit1: ; preds = %for.header
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br label %for.exit1.succ
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for.exit1.succ: ; preds = %for.exit1
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call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !14
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tail call void @bar(i32 %add), !dbg !14
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br label %exit
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for.exit2: ; preds = %for.latch
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call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !14
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tail call void @bar(i32 %add), !dbg !14
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br label %exit
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exit: ; preds = %for.exit2, %for.exit1.succ
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call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !14
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ret void, !dbg !14
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}
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; CHECK: [[VAR]] = !DILocalVariable(name: "sum",
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; CHECK: [[VAR2]] = !DILocalVariable(name: "sum2",
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declare void @bar(i32)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2, nameTableKind: None)
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!1 = !DIFile(filename: "foo.c", directory: "/")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{!"clang version 8.0.0"}
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!6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 10, type: !7, scopeLine: 10, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
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!7 = !DISubroutineType(types: !2)
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!8 = !{!9}
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!9 = !DILocalVariable(name: "sum", scope: !10, file: !1, line: 11, type: !11)
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!10 = !DILexicalBlockFile(scope: !6, file: !1, discriminator: 0)
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!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!12 = !DILocation(line: 0, scope: !10)
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!13 = distinct !DISubprogram(name: "multi_exit", scope: !1, file: !1, line: 10, type: !7, scopeLine: 10, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
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!14 = !DILocation(line: 0, scope: !15)
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!15 = !DILexicalBlockFile(scope: !13, file: !1, discriminator: 0)
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!16 = !DILocalVariable(name: "sum2", scope: !15, file: !1, line: 11, type: !11)
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